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One conducting U tube can slide inside a...

One conducting U tube can slide inside another as shoen in figure maintaining electric contracts between the tubes. The magnetic field B is `bot` to the plane of he figure. If each tube move towards the other at a constant speed V, then the e.m.f. induced in the cirucit in terms of B, l and V, where l is the width of each tube, will be:

A

(a) zero

B

(b) `2BlV`

C

(c) `BlV`

D

(d) `-BlV`

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